1. Centers for Disease Control and Prevention/National Center for Health Statistics, Division of National Health and Nutrition Examination Surveys, Hyattsville, MD
2. National Institutes of Health/Office of Dietary Supplements, Bethesda, MD
3. Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University and School of Medicine and Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA